- #1

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Initially there's: 3mol He/(3mol + 3mol) * 10 atm = 5 atm pressure of He

And: 3/6 * 10atm = 5 atm pressure of N

_{2}as well

now that 2 moles of He are added to the vessel, why wouldn't N

_{2}'s partial pressure increase? The way I see it, there are now more atoms, so more of them would knock on the walls, therefore pressure would increase overall, and since there are now more atoms, space between atoms is tightened, so ...

Anyway, overall pressure is P

_{1}/n

_{1}= P

_{2}/n

_{2}

(10 atm/9 mol) = (P

_{2}/11 mol); P

_{2}= 12.2 atm new total pressure

Partial P

_{He}* P

_{total}= 5/11 * 12.2 atm = 5.545 atm He

That's for He gas, but why shouldn't partial pressure change for N

_{2}gas?